p53-dependent non-coding RNA networks in chronic lymphocytic leukemia

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Mutations in the tumor suppressor p53 are linked to chemotherapy resistance and poor outcomes in chronic lymphocytic leukemia (CLL).
• While p53 targets are known, a complete understanding of non-coding RNA targets affected by p53 dysfunction in CLL is lacking.
• Assessing these non-coding RNAs is crucial for understanding p53's role in DNA damage response and developing targeted therapies.

Purpose of the Study:

• To comprehensively map p53-dependent non-coding RNA targets in CLL using small RNA sequencing.
• To identify novel microRNAs (miRNAs) and long non-coding RNAs (lncRNAs) regulated by p53 in response to DNA damage.
• To investigate the role of identified lncRNAs (NEAT1, lincRNA-p21) in p53-mediated DNA damage response and cell death.

Main Methods:

• Small RNA sequencing was employed to profile non-coding RNAs in CLL cells with varying p53 status.
• Bioinformatic analysis was used to identify p53-dependent miRNAs and lncRNAs.
• Isogenic lymphoma cell line models were utilized to confirm the p53 dependence of NEAT1 and lincRNA-p21 induction.

Main Results:

• The study characterized the landscape of p53-dependent non-coding RNAs induced by DNA damage in CLL.
• Beyond the known miR-34a, several miRNAs (miR-182-5p, miR-7-5p, miR-320c/d) were identified as p53 targets.
• The lncRNAs NEAT1 and lincRNA-p21 were found to be induced by DNA damage in a p53-dependent manner and their induction correlated with cell death.

Conclusions:

• This research elucidates the p53-dependent miRNome in CLL and identifies NEAT1 and lincRNA-p21 as novel components of the p53-mediated DNA damage response.
• These findings highlight the potential of targeting these non-coding RNAs in CLL and lymphoma treatment strategies.
• Understanding the p53-non-coding RNA axis provides new insights into chemoresistance mechanisms and therapeutic avenues in CLL.